Pump



Au 11; 1942. H.-T. KRAFT 2,292,5 7

' PUMP I I Filed Sept. 25, 1939 2 Sheets-Sheet 1 INVENTOR I Herman T- Kraft ATTORNEYS Aug. 11,\ 1942. I T. KRAFT v 2,292,527

PUMP

Filed Sept. 251939 2 She'ets-Shegat 2 nu l I I 'INVENTOR Herman I. Kraft ATTORNEYS Patented Aug. 11,1942

PUMP

Herman T. Kraft, Akron, Ohio, assignor to The General Tire & Rubber Company, Akron, Ohio,

a corporation of Ohio Application September 25, 1939, Serial No. 296,340 7 Claims. (01. Bil-62.6)

This invention relatesto pumps and more particularly to air pumps used in connection with vaso-therapy and for the promotion of artificial respiration in the treatment of respiratory diseases .and' ailments.

It is an object of the invention to provide a.

pump of this character which operates in a uniform and even manner so that the alternations of pressure induced thereby upon a patient receiving treatment will be of the character most suited for the treatment prescribed.

Another object is to provide an air pump which may be moved about from place to place so. as to permit its use successively in connection with a number of patients in different rooms or wards of a hospital or similar institution.

Another object is to provide an air-pump for use in connection with therapeutic devices which is provided with power actuated drive means in combination with hand actuating means, so that either may be used independently of the other.

i More particularly the invention aims to provide iadrive arrangement of this character in which the pump may be rapidly disconnected fromeither the motor actuated drive means or the hand actuated drive means and reconnected to the other, so that there is no suspension in the treatment being given a patient during change.

The invention also aims to provide improvements in the manner of supporting a bellows type pump, improvements in the valve structure, and improvements in the construction and arrangement of the flexible bellows. Other objects and advantages will become apparent from the following detailed description of a suitable embodiment of the invention made in connection with the accompanying drawings in which like parts throughout the several views are indicated by the same numerals of reference.

Figure 1 is a top plan view of the pump showing the same mounted on a supporting structure, together with drive means for the pump;

Fig. 2 is a side elevational view, partly in section and with partly broken away, showing the pump apparatus of Fig. 1;

Fig.3 is a sectional detail taken substantially on the line 3-3 of Fig. 1 and enlarged with respect thereto; I

Fig. 4 is an elevational detail, partly in' section and with parts broken away, showing one end of the pump;

Fig. 5 is a diagrammatic detail with parts re- I moved showing the connection for the link and motor driven crank;

Fig.- 6 is a view's'imilar to'Fig, 5, showing the link and crank disconnected;

Fig. '7 is a diagrammatic elevational view showing the pump actuating link connected to the manual drive; and

Fig. 8 is a sectional detail with parts broken away, taken substantially on the line 88 of Fig.7.

The pump is mounted on' a supporting struc I spaced apart relation. Extending between and.

secured to the pedestals is a sliding rod or bar 5 on which is slidably mounted a hub or sleeve 6.

, Preferably, the rod 5 is of square section and is received in a square opening in the hub 6 so as to prevent rotation of the hub on the rod, see Fig. 8.

The pedestal 4 has an enlarged flat head I which is preferably of circular form,'as shown in Fig. 4. A number of apertures 8 are formed through the head to provide air or gas passageways, ,as will later appear. Portions of the head 1 between the apertures 8 form legs 9 of a spider structure, having a central part l0 into which is threaded or otherwise secured one end of the slide rod 5.

Disposed against one one of the head 1 is hub portion I I -of a fixed or stationary end member I2. An opening l5 in the hub II is aligned or communicates with the openings 8 in the head to permit the passage of air or gas from one side of the'end member l2 to the other. Preferably, a soft gasket l6, also apertured, is interposed between the head and hub II to provide a gas-tight connection therebetween when securing bolts I! which extend through holes in the hub I I and are threaded into the head I are tightened.

Disposed against the outside of the head I and across the openings 8 is a flap or cover l8. The

periphery of this cover seats against the marginal portions of the head I so as to completely cover the apertures 8 and seal'the same against the flow of air into the bellows of the'pump. Any suitable material may be used to form the flap or cover, although a thin metal plate is to be preferred. As shown in Fig. 4, the cover 18 is cirmember 33 of der 42 of the flange a retaining ring 43.

2 cular, being concentric to the circular periphery of the head 1.

Bracket 13 is formed or secured to the coyer 13 below the center thereof and is bifurcated to receive the lower end of an L-shaped arm or link 23 to which the bracket is pivoted at 2|. top portion of the head 1 is formed a boss 22 having a slot or groove 23 which receives the upper end of the link 23. A pin 24 extends through the end of the link 23 and is seated in a socket or recess 25 formed in the boss 22 at right angles to the link receiving slot 23, thus forming a pivotal connection for the link. A keeper or plate element 23 is disposed across the tops of the slots 23 and 23 and is secured to the boss 22 by screws 21. This keeper retains the upper end of the link 23 in the slot 23, there being suincient clearance under the keeper to permit pivotal movement of the link in the slot.

As shown in Fig. 3, the pivotpin 24 is to the left of the cover or plate 13 so that the latter is normally held flatwise against the end of the head 1 by gravity to seal the passages 3 and prevent the flow of air into the bellows therethrough. Upon an increase of air pressure within the bellows, the cover I3 is forced outwardly or away from the head 1, permitting the escape of air or gas through the apertures 3.

Stationary end member l2 extends radially from the hub II and may be integral therewith if desired. Preferably, the end member is slightly dished, having a concavo-convex form to impart rigidity thereto, and has a peripheral axially extending flange 33 of circular form. The bellows, indicated generally at 31, is in the form of an annular band having approximately circular ends 32 and 33. The end 32 is disposed about and embraces the circular flange 33 on the end member l2 and is held in place by a band 34 of steel or similar strong material which is split and provided with ears 35, which may be drawn together by a nut and bolt 33 so as to tighten the band around the bellows and squeeze the ends 32 of the latter against the flange 33, thus forming a strong air-tight seal.

One end of the sleeve 3 is formed with a circular collar or flange the bellows, which is constructed or formed similarly to the end member l2 and has a peripheral circular flange 39 corresponding to the flange 33. Circular edge portion 33 of the bellows 3! is disposed about the circular flange 39 of the end member 33 and secured or retained by a band 43 of steel or similar material which corresponds to the band 34 and is provided with a tightening nut and bolt 4|. Desirably, the end member 33 may be formed with a central aperture which is received over a shoul- 31 and is held in place by Any suitable air or gas tight flexible material may be used for thebellows 3|. It has been found, however, that rubber is most satisfactory and the bellows shown is constructed of such material, suitably compounded and cured. Preferably, the bellows is formed by molding operation and is provided with 'a succession of folds or bands 44 and 45, each of which is of circumferential extent and define annular grooves 43. The folds 44 and 43 permit the bellows to be drawn out longitudinally or compressed together by movement of the end member 33 without objectionable distortion of the rubber material forming the bellows. V

Internally of the bellows a series of reinforcing 31 which receives end I the air or gas is pumped by rings '41 are disposed in the folds 44, being separated by the material of the bellows on the opposite sides of the annular grooves 43. The rings 44 are annular in extent or approximately so. and serve to support the bellows, thus preventing collapse of the same during expansion and contraction. when the present device is used for the purpose of partially evacuating a therapeutic device the decrease in air pressure within the bellows 3| results in the imposition of a great atmospheric force on the bellows which is withstood largely by the rings 41. Thus, these rings retain the folds 44 and 45 of the bellows in their correct relative position with respect to one another and also prevent collapse of the bellows which would otherwise interfere with proper functioning of the pump.

A cup 43 is formed or secured on the end member l2 and carries a safety valve indicated generally at 43 which is arranged to admit air or gas from the atmosphere into the bellows chamber in the event that the amount of vacuum created therein should become excessive. The particular form of the valve 43 forms no part of the present invention and it may be of conventional construction. Also attached to the stationary head I2 is a conduit 53 through which actuation of the bellows. This conduit may be secured to the end member l2 by means of a reinforcing or attaching plate 31, and adjustable air or gas escape valve is carried by the conduit 53 and comprises a fixed cup 52 and an adjustable cup 53, the latter being threadedly received by threaded portion 54 of the conduit 53. Apertures through the conduit 53 communicate with an annular space between the cups 52 and 53 and this annular space communicates with the atmosphere through annular slot or groove- 35 between the peripheries of the cups 52 and 53. By rotation of the cup 53 on the threads 54 the width of the annular slot 55 may be adjusted so as to vary the resistance to the flow of air or gas into or out of the conduit 53 therethrough. In this manner the degree or amount of vacuum induced by the pump may be adjusted to suit the requirements of the particular treatment prescribed. Onthe end of the conduit 53 is secured a flexible hose 53 which is of air or gas tight construction and connects the pump to the therapeutic device being used.

An electric motor 51 for actuating th pump is mounted or secured on the base I adjacent the pedestal 3 and by means of a flexible chain or belt 53 drives pulley 3| mounted on a shaft 32 journaled in a housing 33 also secured on the base I. adjacent the pedestal 3. Through suitable reduction gearing, not shown, the shaft 52 drives a shaft 34, also journaled in th housing 33, and rotatable at a much slower rate of speed than the shaft 32 and motor 51 aroimd an axis disposed at approximately a right angle relative to direction of reciprocation of the end member 33 on the shaft 5. A crank arm 35 is secured on the end of the shaft 34 and carries a crank pin 33 having a reduced diameter portion 31.

Connecting rod or link 33 extends between the crank and movable end member 33, being pivotally secured at 33 to a bracket 13 mounted on the exposed end of the sleeve 3. The crank end of the link 33 is formed with a transverse slot or notch 13 which receives the reduced diameter portion 31 of the crank 33, the shoulders formed by the large diameter portions of the crank serving to prevent the end of the link from slipping; off the reduced diameter portion 31. Slidably mounted in a groove 14 formed in the link 88 is a latch 18 which is movable across the open end of the notch 13, as shown in Fig. 5, thus retaining the crank pin in the notch. A helical compression spring 16 is disposed in the groove or bore H between the end thereof and the inner end of the latch I so as to normally urge the latch outwardly into pin locking position. A slot 1'! is formed in the link 68 and in communication with the groove or bore 14. In this slot is mounted a lever 18 which is pivoted at 18 and has an extension portion 80 receivable in a recess or opening 8| formed in the latch 15 When the lever 18 is drawn upwardly so as to turn on the pivot 18, the extension portion 88 of the lever draws the latch 15 from beneath the crank 88, releasing the latter from the notch I3 so that the same upwardly pressure which is employed in releasing the latch serves to raise the link 88 away from the crank, as shown in Fig. 6.

In normal operation of the device the crank arm 65 is rotated by the motor 51' so as to reciprocate the link or connecting'rod 68, thus imparting reciprocatory movement to the end member 38 on the rod 5 and alternately expanding and contracting the bellows 3 I. In case of emergency the pump of the present invention can be manually operated. Although this can be accomplished by grasping the link 88 after releasing the same and forcing the end member 38 back and forth on the rod 5, the manual operation can be efiected by means of a hand lever 82 secured on a shaft 83 rotatably mounted in journals 84 and 85 secured to the underside of the frame I. An arm 81 is secured on the inner end of the shaft 83 and when in operative position extends upwardly the refrom through an aperture 88 formed in the base I. i

The end of the arm 81 carries a crank-89 which is similar to the crank 66 and'has a reduced diameter portion 90 which is receivable in the notch 13 of the link 68.

Normally the hand lever 82 is disposed in a sub-.

stantially horizontal position along one side of the base I and rests on a suitable support pin 8|. When it is desired to convert the pump from motor driven to manual operation, the operator or attendant raises the hand lever 82 from the horizontal position shown in Fig. 2 to an upright position such as indicated by the broken lines of that figure. Simultaneously with this movement of thehand lever, the link 68 is released from the motor driven crank 66 in the manner previously described and with the quick release latch 15 still withdrawn from across the opening of the notch 13, the latter is disposed over the crank 88 of the arm 81. As soon as this connection is made the lever 18 is released so that the spring 16 forces the latch '15 across the opening of the notch 13, thus locking the crank 88 in the motion. Manual operation of the pump may be then effected by reciprocating the hand lever 82 between the full line and broken line positions indicated in Fig. 7. It is preferable to move the motor driven crank 66 either manually or otherwise to its lowermost position when manually operating the. pump. As shown in Fig. 8, the reduced diameter portion 98 of the crank 89 on the lever 81 is reciprocable in the plane of rotation of the reduced diameter portion 51 of the crank 88 on the arm 65. The arms 81 and 65 carrying the cranks are offset from one another and from the plane in which the reduced diameter portions of the cranks move, so that the crank 88 does not interfere with the movement of the crank 81 during manual operation of the pump. When it is desired to keep the pump in substantially continuous operation while moving a A patient from one part of the building to another, a long extension cord or similar arrangement may be provided to furnish power to the motor 51 through the electrical 92.

When it becomes necessary or desirable to change from manual operation to motor driven ruption orlapse of the alternations of pressure and vacuum imposed upon the patient. This is particularly true in the case of devices for inducing artificial respiration. It is to be further observed that the present invention provides a vacuum pump having a very simple construction so that the same may be readily repaired in case of breakage and so that the attendant or operator in charge of the same may keep the machine in emcient working order at all times.

The principles of the present invention may be utilized in various ways, numerous modifications and alterations being contemplated, substitution of parts and changes in construction being resorted to as desired, it being understood that the embodiments shown in the drawings and described above are given merely for purposes of explanation and illustration without intending to limit the scope of the claims to the specific details. disclosed.

- What I claim is:

1. An air pump for therapeutic apparatus comprising a base, spaced pedestals on the base, an opening through one of the pedestals and a spider structure in the opening, a rod extending between the pedestals and connected to the spider structure,,a pair of end members disposed in confronting relation to one another about the rod, a flexible'sleeve-like bellows disposed about the rod, and means securing the ends thereof to the end members, an elongated hub on one end member and slidably embracing the rod for movement along the latter, a central opening'in the other end member, and means securing said other end member to said one pedestal with the openings in register, valve means supported across the opening in the pedestal to restrict the pin movable over an arcuate path intersecting the circular path, manual means for reciprocating the arm, link means connected to the movable member and having latch means for opconductors indicated at I tionally connecting the link means to the crank pin or the arm pin.

' 3. Gas pump structure comprising a support ing pedestal having at one end a head formed with a gas outlet aperture, a rigid end member of generally circular form and larger than said head secured to the latter and solely supported thereby, said end member having an aperture aligned with the aperture in the head, valve means associated with the aligned apertures to regulate the flow of gas therethreugh, a spider disposed across one of the apertures, a bellows having one end thereof attached to the end member and supported thereby, and a slide rod for supporting the other end of the bellows and having one end secured to and supported by the spider.

4. Gas pump structure comprising a supporting pedestal having at one and ahead formed with a gas outlet aperture, a rigid end member of generally circular form and larger than said head secured to the latter and solely supported thereby, said end member having an aperture aligned with the aperture in the head, a spider disposed across one of the apertures, a bellows having one end thereof attached to the end member and supported thereby, a slide rod for supporting the other end of the bellows and having one end secured to and supported by the spider, a cover and means mounting the cover across one of the apertures for movement by the pressure of gas flowing through the apertures to displace the cover from across the aperture.

5. A gas pump comprisinga base and a pair of spaced pedestals mounted thereon, one of said pedestals having a head formed with a gas passage aperture, a spider across said aperture, a slide rod extending between the spider and the other pedestal, a bellows disposed about the rod.

a pair of rigid members secured to the ends of the bellows for expanding and contracting the bellows, one of the end members having a hub slidable on the rod and the other end member being larger than the pedestal head and centrally secured to the latter, said other end member being supported solely by the head and having a gas passage aperture aligned with the head aperture, valve means associa with the aligned apertures to regulate the flow of gas therethrough, and means for sliding said one end member back and forth along the rod.

6. In a therapeutic air pump having a supporting structure and a bellows mounted thereon, a movable member actuable to expand and contract the bellows, a rotatable crank and an electric motor for actuating the same on the structure, a manually actuable reciprocable hand lever on the structure, a link having one end pivotally connected to said member, and a quick release latch being alternatively connectable to the crank for actuation of the bellows by the motor, or to the hand lever ior manual actuation of the bellows.

'1. 'An air pump unit for therapeutic apparatus comprising a supporting structure, a bellows carried by the structure and having a movable member actuable for expanding and contracting the bellows, an electric motor mounted on the structure, a crank connected to the motor to be rotated thereby in a circular path, a second crank and means supporting structure for movement over a path in substantially the same plane as the motor rotated crank, manually actuable lever means connected to the second crank ior actuating the same, a link connected at one end to the movable member of the bellows, and a quick release latch on the other end of the link, said latch being alternatively connectable to the motor driven crank for actuation of the bellows by the'motor, or to the second crank for actuation of the bellows manually, the path 01 each crank including a portion beyond the path-of the other crank and to which the same can be moved to avoid interference between the cranks.

. HERMAN T. KRAFT.

the same on the 

